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A232288 Number of n X n 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally.

%I A232288 #8 Jul 23 2025 07:15:28
%S A232288 1,15,1313,718483,2885285507,84130295708483,17291702408190208843,
%T A232288 25164969879062538935257597,260198076410481338310694223844235,
%U A232288 19101564590400937625024602276497985649471
%N A232288 Number of n X n 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally.
%C A232288 Diagonal of A232295
%H A232288 R. H. Hardin, <a href="/A232288/b232288.txt">Table of n, a(n) for n = 1..12</a>
%e A232288 Some solutions for n=3
%e A232288 ..2..0..1....2..1..2....2..2..1....2..1..1....1..2..2....0..1..0....2..2..1
%e A232288 ..2..2..2....2..1..0....1..0..2....1..2..2....2..2..1....2..2..1....2..1..0
%e A232288 ..0..1..2....2..2..2....1..2..2....0..1..2....2..1..2....2..2..1....0..2..1
%K A232288 nonn
%O A232288 1,2
%A A232288 _R. H. Hardin_, Nov 22 2013